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Date:	Fri,  8 Aug 2014 13:37:06 -0700
From:	Kamal Mostafa <>
Cc:	Jorge Daniel Sequeira Matias <>,
	Nicholas Bellinger <>,
	Kamal Mostafa <>
Subject: [PATCH 3.13 003/259] target: Explicitly clear ramdisk_mcp backend pages -stable review patch.  If anyone has any objections, please let me know.


From: Nicholas Bellinger <>

[Note that a different patch to address the same issue went in during
v3.15-rc1 (commit 4442dc8a), but includes a bunch of other changes that
don't strictly apply to fixing the bug.]

This patch changes rd_allocate_sgl_table() to explicitly clear
ramdisk_mcp backend memory pages by passing __GFP_ZERO into

This addresses a potential security issue where reading from a
ramdisk_mcp could return sensitive information, and follows what
>= v3.15 does to explicitly clear ramdisk_mcp memory at backend
device initialization time.

Reported-by: Jorge Daniel Sequeira Matias <>
Cc: Jorge Daniel Sequeira Matias <>
Signed-off-by: Nicholas Bellinger <>
Reference: CVE-2014-4027
Signed-off-by: Kamal Mostafa <>
 drivers/target/target_core_rd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c
index 4ffe5f2..a97107c 100644
--- a/drivers/target/target_core_rd.c
+++ b/drivers/target/target_core_rd.c
@@ -178,7 +178,7 @@ static int rd_build_device_space(struct rd_dev *rd_dev)
 						- 1;
 		for (j = 0; j < sg_per_table; j++) {
-			pg = alloc_pages(GFP_KERNEL, 0);
+			pg = alloc_pages(GFP_KERNEL | __GFP_ZERO, 0);
 			if (!pg) {
 				pr_err("Unable to allocate scatterlist"
 					" pages for struct rd_dev_sg_table\n");

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